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comparison src/strcmp.c @ 442:abe6d1db359e r21-2-36

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Import from CVS: tag r21-2-36
author cvs
date Mon, 13 Aug 2007 11:35:02 +0200
parents 3ecd8885ac67
children
comparison
equal deleted inserted replaced
441:72a7cfa4a488 442:abe6d1db359e
34 34
35 #define MAGIC 0x7efefeff 35 #define MAGIC 0x7efefeff
36 #define HIGH_BIT_P(c) ((c) & hi_bit) 36 #define HIGH_BIT_P(c) ((c) & hi_bit)
37 #define HAS_ZERO(c) (((((c) + magic) ^ (c)) & not_magic) != not_magic) 37 #define HAS_ZERO(c) (((((c) + magic) ^ (c)) & not_magic) != not_magic)
38 38
39 /* CONST IS LOSING, but const is part of the interface of strcmp */
40 int 39 int
41 strcmp (const char *x, const char *y) 40 strcmp (const char *x, const char *y)
42 { 41 {
43 if (x == y) 42 if (x == y)
44 return 0; 43 return 0;
45 else if (ALIGNED (x) && ALIGNED (y)) 44 else if (ALIGNED (x) && ALIGNED (y))
46 { 45 {
47 CONST unsigned long *x1 = (CONST unsigned long *) x; 46 const unsigned long *x1 = (const unsigned long *) x;
48 CONST unsigned long *y1 = (CONST unsigned long *) y; 47 const unsigned long *y1 = (const unsigned long *) y;
49 unsigned long c; 48 unsigned long c;
50 unsigned long magic = MAGIC; 49 unsigned long magic = MAGIC;
51 unsigned long not_magic = ~magic; 50 unsigned long not_magic = ~magic;
52 unsigned long hi_bit = 0x80000000; 51 unsigned long hi_bit = 0x80000000;
53 52
57 { 56 {
58 if (!HIGH_BIT_P (c)) 57 if (!HIGH_BIT_P (c))
59 return 0; 58 return 0;
60 else 59 else
61 { 60 {
62 x = (CONST char *) x1; 61 x = (const char *) x1;
63 y = (CONST char *) y1; 62 y = (const char *) y1;
64 goto slow_loop; 63 goto slow_loop;
65 } 64 }
66 } 65 }
67 66
68 x1++; 67 x1++;
69 y1++; 68 y1++;
70 } 69 }
71 70
72 x = (CONST char *) x1; 71 x = (const char *) x1;
73 y = (CONST char *) y1; 72 y = (const char *) y1;
74 goto slow_loop; 73 goto slow_loop;
75 } 74 }
76 else 75 else
77 { 76 {
78 char c; 77 char c;
89 } 88 }
90 } 89 }
91 90
92 91
93 int 92 int
94 strncmp (CONST char *x, CONST char *y, size_t n) 93 strncmp (const char *x, const char *y, size_t n)
95 { 94 {
96 if ((x == y) || (n <= 0)) 95 if ((x == y) || (n <= 0))
97 return 0; 96 return 0;
98 else if (ALIGNED (x) && ALIGNED (y)) 97 else if (ALIGNED (x) && ALIGNED (y))
99 { 98 {
100 CONST unsigned long *x1 = (CONST unsigned long *) x; 99 const unsigned long *x1 = (const unsigned long *) x;
101 CONST unsigned long *y1 = (CONST unsigned long *) y; 100 const unsigned long *y1 = (const unsigned long *) y;
102 unsigned long c; 101 unsigned long c;
103 unsigned long magic = MAGIC; 102 unsigned long magic = MAGIC;
104 unsigned long not_magic = ~magic; 103 unsigned long not_magic = ~magic;
105 unsigned long hi_bit = 0x80000000; 104 unsigned long hi_bit = 0x80000000;
106 105
114 { 113 {
115 if (!HIGH_BIT_P (c)) 114 if (!HIGH_BIT_P (c))
116 return 0; 115 return 0;
117 else 116 else
118 { 117 {
119 x = (CONST char *) x1; 118 x = (const char *) x1;
120 y = (CONST char *) y1; 119 y = (const char *) y1;
121 goto slow_loop; 120 goto slow_loop;
122 } 121 }
123 } 122 }
124 123
125 x1++; 124 x1++;
126 y1++; 125 y1++;
127 } 126 }
128 127
129 x = (CONST char *) x1; 128 x = (const char *) x1;
130 y = (CONST char *) y1; 129 y = (const char *) y1;
131 goto slow_loop; 130 goto slow_loop;
132 } 131 }
133 else 132 else
134 { 133 {
135 char c; 134 char c;